Go Job Hunting at the LQ Job Marketplace
Go Back > Forums > Linux Forums > Linux - Server
User Name
Linux - Server This forum is for the discussion of Linux Software used in a server related context.


  Search this Thread
Old 09-17-2007, 02:29 PM   #1
LQ Newbie
Registered: Jun 2004
Posts: 10

Rep: Reputation: 0
My outgoing email is getting flagged as spam

I'm using sendmail on a dedicated server I lease from, running FC4. This server has two domain names, including the original generated by incorporating its static IP address ( and the domain name I registered for it . If you reverse IP lookup the IP address, you only get the name, not mine. I've had trouble choosing a domain name for confDOMAIN_NAME that doesn't cause lots of email to be rejected as SPAM, because I think receiving SMTP servers both (a) do a reverse IP address lookup on the address which connected to them and discover the name doesn't match the name given by the EHLO/HELO command, and (b) check the EHLO/HELO name for various suspicious characteristics. I'm assuming the confDOMAIN_NAME setting is used as the EHLO/HELO domain name. If I use the name for the server in confDOMAIN_NAME, various SPAM filters give all the email really high scores because of the IP address incorporated in the name. If I use my domain name, other servers flag me as SPAM because the reverse IP address lookup gives the name.

I'm a sendmail newbie. Am I understanding the problem correctly? Any advice?
Old 09-17-2007, 07:35 PM   #2
Senior Member
Registered: Oct 2003
Location: New York City
Distribution: Debian Sid 2.6.32
Posts: 2,100

Rep: Reputation: 48
The best way to solve that is to write to your ISP for the server (I'm guessing, but the reverse says Tell them you want to run a mail server, and you need a PTR (reverse DNS record) for the server. If the forward DNS name of your server is, then the PTR should be the same,, coupled with the IP address.



Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
stop outgoing spam zovres Linux - General 5 04-28-2009 08:16 AM
Detect outgoing spam Jefficus Linux - Security 5 04-28-2009 07:57 AM
mailserver- my outgoing mail is spam ? kitek Linux - Newbie 5 04-28-2009 07:53 AM
why is my outgoing mail considered spam to others kitek Linux - Networking 4 04-17-2005 06:31 PM
Stopping outgoing spam dtugg Linux - Software 1 04-04-2005 05:32 AM

All times are GMT -5. The time now is 08:52 PM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration